It happened once, and today it happened again.
I was fighting in WvW EB, and sudddenly my character got quickness but without the boon icon showing up… then, upon weapon change, it appeared faster than quickness (so fast most skills other than auto-atack won’t trigger) and it remained like that forever.
I don’t know what triggered it. First time it happened, I was fighting a human oponent, second time I was fighting a scout npc.
I run Win7, no 3rd party software running other than TS.